On rx, the ENA PMD sets tx offload flags based on the
received packet's l4 protocol. This means you need
to turn off those offloads for every packet if you
encapsulate packets arriving on an interface using
that PMD. Disable this behavior.
Change-Id: Icae9f32e3d292d767da440ae5c1280902bdaa083
Signed-off-by: Matthew Smith <mgsmith@netgate.com>